# str -- int -- float -- bool
int("123")
int("123.5")
float('123.5')
int(float('123.5'))
int(True)
int(False)
1 == True
2 == True
0 == False
bool(1)
bool(2)
bool(0)
bool('abc')
bool('0')
# list -- tuple -- set
tuple(set([1, 2, 3, 4, 5, 5, 4, 3, 2, 1]))
